I run my system as a dual-boot with Windows 11 Pro and Ubuntu. So when I boot up I first see a bootloader asking me to choose which operating system I want. The hard drive is partitioned and Windows can't access/doesn't know about the Linux partition. This was setup starting with a Windows 11 only computer and then installing a standard ubuntu with dual boot setup. After a recent automatic Windows update I don't see the bootloader anymore and...
Originally asked by quarague on Stack Exchange (superuser) (CC BY-SA 4.0).